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| author | Huang Ying <ying.huang@intel.com> | 2017-09-06 16:22:23 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-09-06 17:27:27 -0700 |
| commit | f0eea189e8e969b66e03bac8a7d92888ba267854 (patch) | |
| tree | 4af1e27e1cc318c37b1b447ff4a65a2f5048dea7 | |
| parent | ba3c4ce6def4915093be80585ff69f780630f32f (diff) | |
| download | linux-f0eea189e8e969b66e03bac8a7d92888ba267854.tar.gz linux-f0eea189e8e969b66e03bac8a7d92888ba267854.tar.bz2 linux-f0eea189e8e969b66e03bac8a7d92888ba267854.zip | |
mm, THP, swap: don't allocate huge cluster for file backed swap device
It's hard to write a whole transparent huge page (THP) to a file backed
swap device during swapping out and the file backed swap device isn't
very popular. So the huge cluster allocation for the file backed swap
device is disabled.
Link: http://lkml.kernel.org/r/20170724051840.2309-5-ying.huang@intel.com
Signed-off-by: "Huang, Ying" <ying.huang@intel.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Hugh Dickins <hughd@google.com>
Cc: Shaohua Li <shli@kernel.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: "Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Ross Zwisler <ross.zwisler@intel.com> [for brd.c, zram_drv.c, pmem.c]
Cc: Vishal L Verma <vishal.l.verma@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | mm/swapfile.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/mm/swapfile.c b/mm/swapfile.c index 2bfbfb87123a..267b1fe41844 100644 --- a/mm/swapfile.c +++ b/mm/swapfile.c @@ -948,9 +948,10 @@ start_over: spin_unlock(&si->lock); goto nextsi; } - if (cluster) - n_ret = swap_alloc_cluster(si, swp_entries); - else + if (cluster) { + if (!(si->flags & SWP_FILE)) + n_ret = swap_alloc_cluster(si, swp_entries); + } else n_ret = scan_swap_map_slots(si, SWAP_HAS_CACHE, n_goal, swp_entries); spin_unlock(&si->lock); |